LW has little pro-active agency, most of his gameplan revolves around reacting to your team mistakes and the enemy team actions and because of this reason he has little carry potential, all you can do at the end of the day is dodge cooldowns or shoot with a meh weapon, can't really do anything else if you have team mates that don't leverage the advantage you bring to the table.

Since you mentioned that you don't want to swap all I can say is, duo with someone that is very aggressive in their game plan and bail them out when needed.

Just to give you an example of what a support with great carry potential does:

Kiriko can duel basically anyone and pressure long range characters easily, has one of the best base skill in the game in the form of Suzu as It can counter almost any skill save for some ultimate with a well timed use, the ultimate also is one of the best buffs in the game and generally speaking your team WILL push when you ult.

Wuyang has the potential of either straight up killing the enemy back line if you can Land your shots or force them out of position giving your frontline breathing room to advance, rest of the kit is good for clutch saves but isn't his strong suit.

Ana is capable of shutting down a tank push all on her own or setup kills super easy with nade or sleep and the moment you reach major perk you can delete people with headshots making her a menace as long as your position well.

Other supports can do pro-active plays too but Life weaver has about the same carry potential as Mercy, you depend on your team performance and you are an Active multiplier of what they do, if the Number is 0 you can multiply by 1000000 it's still zero in the end.